<template>
  <view class="viewport">
    <!-- 推荐封面图 -->
    <view class="cover">
      <image class="image" mode="widthFix" :src="bannerPicture"></image>
    </view>
    <!-- 选项 -->
    <view class="tabs">
      <text
        v-for="(item, index) in subTypes"
        :key="item.id"
        class="text"
        :class="{ active: index === activeIndex }"
        @click="activeIndex = index"
        >{{ item.title }}</text
      >
    </view>
    <!-- 推荐列表 -->
		<!-- v-show适合高频率的显示和隐藏 -->
    <scroll-view
      enable-back-to-top
      v-for="(item, index) in subTypes"
      :key="item.id"
      v-show="activeIndex === index" 
      scroll-y
      class="scroll-view"
      @scrolltolower="onScrolltolower"
    >
			<!-- 商品列表 -->
			<GoodsList :goodsList="item.goodsItems.items" :finish="finish"/>
    </scroll-view>
  </view>
</template>

<script setup lang="ts"> 
import {onLoad} from '@dcloudio/uni-app'
import GoodsList from '@/components/GoodsList.vue'
import { ref } from 'vue'
import {SubTypeItem} from '@/types/hot.d'
import { getHotRecommendAPI } from '../../services/hot'

//uniapp获取页面参数	
const query = defineProps<{
	type: string
}>()

// 热门推荐页 标题和url
const urlMap = [
  { type: '1', title: '特惠推荐', url: '/hot/preference' },
  { type: '2', title: '爆款推荐', url: '/hot/inVogue' },
  { type: '3', title: '一站买全', url: '/hot/oneStop' },
  { type: '4', title: '新鲜好物', url: '/hot/new' },
]

const currUrlMap = urlMap.find((v)=>{
	return v.type == query.type //map返回一个array，return true把这组数据加入array
})
// // 动态设置标题
uni.setNavigationBarTitle({ title: currUrlMap!.title }) //!非空断言

// 推荐封面图
const bannerPicture = ref('')
// 推荐选项,里面包含了数据
const subTypes = ref<SubTypeItem[]>([]) 
// 高亮的下标
const activeIndex = ref(0)

//获取热门推荐数据
async function getHotRecommendData(){
	const res = await getHotRecommendAPI(currUrlMap.url, {page: 1,pageSize: 10,})
	//推荐分页图
	bannerPicture.value = res.result.bannerPicture
	//推荐选项
	subTypes.value = res.result.subTypes
}

// 页面加载
onLoad(()=>{
	getHotRecommendData()
})

const finish = ref(false)
// 滚动触底
async function onScrolltolower(){
  // 获取当前选项, 这样多个tab可以分开分页请求
  const currsubTypes = subTypes.value[activeIndex.value]
  // 分页条件 小于总页数
  if (currsubTypes.goodsItems.page < currsubTypes.goodsItems.pages) {
    // 还有商品,当前页码累加
    currsubTypes.goodsItems.page++
  } else {
    // 标记已刷到底
    finish.value = true
    // 退出并轻提示
    return uni.showToast({ icon: 'none', title: '没有更多数据了~' })
  }

  // 调用API传参
  const res = await getHotRecommendAPI(currUrlMap!.url, {
    subType: currsubTypes.id,
    page: currsubTypes.goodsItems.page,
    pageSize: currsubTypes.goodsItems.pageSize,
  })
	// console.log(res.result.subTypes[activeIndex.value])
	
  // 新的列表选项
  const newsubTypes = res.result.subTypes[activeIndex.value]
  // 数组追加到商品列表
  subTypes.value[activeIndex.value].goodsItems.items.push(...newsubTypes.goodsItems.items)
}
</script>

<style lang="scss">
page {
  height: 100%;
  background-color: #f4f4f4;
}
.viewport {
  display: flex;
  flex-direction: column;
  height: 100%;
  padding: 180rpx 0 0;
  position: relative;
}
.cover {
  width: 750rpx;
  height: 225rpx;
  border-radius: 0 0 40rpx 40rpx;
  overflow: hidden;
  position: absolute;
  left: 0;
  top: 0;
  .image {
    width: 750rpx;
  }
}
.scroll-view {
  flex: 1;
}
.tabs {
  display: flex;
  justify-content: space-evenly;
  height: 100rpx;
  line-height: 90rpx;
  margin: 0 20rpx;
  font-size: 28rpx;
  border-radius: 10rpx;
  box-shadow: 0 4rpx 5rpx rgba(200, 200, 200, 0.3);
  color: #333;
  background-color: #fff;
  position: relative;
  z-index: 9;
  .text {
    margin: 0 20rpx;
    position: relative;
  }
  .active {
    &::after {
      content: '';
      width: 40rpx;
      height: 4rpx;
      transform: translate(-50%);
      background-color: #27ba9b;
      position: absolute;
      left: 50%;
      bottom: 24rpx;
    }
  }
}
</style>